Aaeon van guysling



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The letters G G indicate a plate-valve hav- I D ATES J OF I E,

AARON VAN. cUrsLINe, OF'ALBANY, NEWYORK.

' CUT-OFF VALVE.

SPECIFICATION forming part of LettrsPatefl No. 391,190, dated April 17, 1388. Application filed October 12, 1887. Serial No. 252,107. (No model.) I I To all whom it may concern.- Be it known that I, AARON VAN GUYSLING,

I of Albany, in the county of Albany and State of New York, have invented certain new and useful Improvements in Cutoff Valves; and I do herebydeclare that thefollowing is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and

to the l'etters'of reference marked thereon,.

resents a perspective view of my improved cut-oil mechanism for a stationary engine. Fig.2 represents a similar view of amodification of the same for a reversible engine; and Fig. 3 represents a longitudinal vertical sectional view of the cylinder and valve-chest of an engine, showing my improved cut-oft mechanism applied thereto.

In the present instance my invention is Y the cylinder ateither side of the" piston alternately, as usual. Within each valve-chest, directly'adjacent to the ports, are locatedpartition-plates D, having port-apertures E E arranged radially to the axis of oscillation of the cylinder, and preferably of a V or angular ing a fiat face at one side, which is seated against the outer face of the partition, before mentioned, when the valve is'in place. Of course it is to be understood that a valve must be provided for each hollow trunnion or valve In the accompanying drawings, Figure 1 rep-,

.shown in connection with an oscillating enchest. The valve is provided with a central boss, H, on its bearing-face, which fits in acentral, recess in the partition-.plate,so as to'permit the cylinder to move accurately with -re- -5 5 spect to the valve. The saidvalvehas'straight j l sides and segmental ends, the arc. of the seg ments being'struck on a circle slightly less.

than the interior diameter of the valve-chest,

so as to fit accurately therein, and at the same .60,

time allow the proper oscillating movement. 7

Tofthe outer face ofeachivalve, andextending. transversely across it midway between'the segmental ends, is secured a bridge-plate, I, which is provided with 'a'hollow sleeve com.- 6 5 'municatingwith the s'pacebetween said. plate p I and the 'valve-plate,-.forming a steam passage at each side. of the bridge-plate. The valve when applied to an oscillating engine; is provided with twoV-shaped or triangular ports, j

K, which setra'dially to theaxis of oscillation .of. the engine and which correspond to'the 'p'0rt;apertures E E in thev partition-plate, be-* fore mentioned, the positions of ther ports K 1 inthe valve being so arranged relatively that 7 5 while one of the port-aperturesE is in oOmmu- 1 nication with one of the ports-K the other port-aperture and port are out of communication, and vice versa. 7

which consists, as shown in Fig. 1, of two;an gularwings extending from a central boss, through which passes a valve-stem, M. The wings are so located with respect to each other;

as to wholly or partiallyuncover the ports ,K I

simultaneously, so asto permita greater or less volume of steam to; pass throughsaid ports, or to cover them entirely and simulta- I tral' boss-being centered in the central aperture neously', so as to wholly cutoff the passage. of the steam to allow it to act expansivelyJ-The inner end of the valve-stem has a bearing in the central boss ofthe plate-valva'so'as to j permit said plate and cut-off valve to oscillate independently of each other, the movement of the cut-off valve being limited by stops N on the plate-valve.

As before mentioned," the valve G is seated closely against the partition-plate D, its cenin said plate. The hollow sleeve extends out- ,Ward through a packed aperturein the head or cover P, so as to be secured to a suitable The letter L indicates the cut-oftvalve, so

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stationary standard forming part of or secured to the stationary bed of the engine. The outer end of the sleeve is provided with a suitable cap having a central aperture through which the valve-stem passes, and the cap is provided with a branch pipe connecting with a steaminduction pipe leading from the boiler or generator. The projecting end of the valvestem is to be connected with the governing mechanism of the engine, or any other means by which it may be operated to open and close the ports K, as before mentioned.

\Vhen applied to 'a reversible engine, the partition-plates and the plate-valve are provided, respectively, with three instead of two triangular port-apertures, and the valve-sleeve is journaled so that it may be turned whenrequired, being provided with a suitable lever 'for the purpose. The cut-off valve in this instance is provided with three wings corresponding to the ports and adapted to cover or uncover the same simultaneously, as before mentioned. By operating the lever so as to change the port-apertures E and K the engine may be reversed; but as the reversible feature forms no part of my present invention further description is unnecessary.

The trunnion B constitutes the exhaust-chest of the engine,into which lead the exhaust-ports O. The said exhaust-chest is provided with a partition, D, similar to the partition-plate D, and with a valve, G, provided with ports K, similar to the ports in the valve G, but so arranged that when one of the ports K of the 1. The combination of the cylinder, its ingress and egress ports on oppositesides thereof, and the valve-chest, with the main valve G in said chest for alternately opening and closing the ingress-ports, and the oscillating cut-ofl' valve L, pivoted upon the valve G and adapted to regulate the admission of steam therethrough, all constructed and arranged to 0perate substantially in the manner and for the purpose described.

2. The combination, with the va1ve-chest of an engine having ports leading to each end of the cylinder, of the platevalve having corresponding ports, the cut-off valve having wings adapted to cover and uncover the ports simultaneously, and the bridge-plate and hollow sleeve through which steam is admitted to the valve-chest, substantially as specified.

3. The combination, with the steam-chest having ports leading to each end of the cylinder, of the plate-valve having port-openings and a central boss for centering the valve in the chest, and the bridge-plate and hollow sleeve whereby steam is admitted to the valve- AARON VAN GUYSLING.

Witnesses:

PETER H. ZEH, E. H. VAN VLIET. 

